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Date: Wed, 05 Jan 2005 23:33:01 GMT
From: T <tberknospamlobal.net>
Subject: Re: c900 1984 - One or TWO Fuel Pumps?


Dave Hinz wrote: > On Wed, 05 Jan 2005 22:17:34 GMT, T <tberknospamlobal.net> wrote: <snip> > >>Under the car, right by the tank, right near the wheel is a fuel >>accumulator. It has a diaphragm and a spring inside it's job is to >>provide _some_ pressure to avoid the equivalent of vapor lock. > > > Ah, there. Yeah, the filter is probably closer to the front of > the car, and looks, well, filter-like. Beer can type thing > with the usual banjo fittings & a hex on one end, held to > the body with the clamp that you'd expect. > Yeah. Fuel Filter is in the motor bay. Big ol honking Bosch filter. Mounted on the inside of the fender, it's right next to the Fuel Distributor. > >>>I think that's called the "pre-pump". You need voltage there or you'll >>>get... >>> >> >>Yep, I get 12v at the relay in the engine bay but no 12v back at the >>prepump. > > > Do you have a wiring diagram for the '84? If not, let me know and I > can take a look for you. The Bentley manual should have what you > need, if not I have the full set of c900 shop manuals. > It's really my roommate's car, he has a Haynes around somewhere (lost) that I bought for him, no Bentley at the moment. > >>>Have you checked fuses and/or relays marked fuel pump? > > > >>Now, one thing to add; I didn't jumper around the relay and I did find >>and replace a 25 or 30 amp fuse for the pump. It has a known good fuse >>right now. > > > Was the old one known bad, or was this just a "let's eliminate that > from the equation" step? > The latter, it's a common trick to get you back home if you have a fuel problem is to pull the relay and jumper the hot to the pump leads. >>What I might do next is jumper the Hot 12v to the fuel pump feed to see >>what happens. (At one point I put a battery charger's 2A/12V feed to >>that pump and it didn't seem to do anything so maybe I have multiple >>problems.) > > > Well, you could have no voltage there because it's shorted, but then > you'd have a fuse blown somewhere. Something isn't adding up here just > yet. > > Dave Hinz The relay has one always hot 12v and it's corresponding ground. It also has a 'latch' side with switched 12v (from the Ign switch) and it's 'ground- in this case by way f running through the fuel pump. The idea is to hard wire the 12v directly to the pump, the draw back is it's keep running with the key off, until you pull the wire. TBerk

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